Endoscopic Retrograde Cholangiopancreatography

• Department of gastroenterology, Successful Hospital of Xiamen university — Xiamen, Fujian, China
• Huaihe Hospital of Henan University — Kaifeng, Henan, China
• Endoscopic center, Xijing Hospital of Digestive Diseases — Xi'an, Shaanxi, China
• Department of gastroenterology, Second Affiliated Hospital of Chongqing Medical University — Chongqing, China

Not specified

• Duke University Medical Center — Durham, North Carolina, United States

• Severance Hospital, Yonsei University — Seoul, South Korea

• University of Florida/Shands UF Endoscopy Center — Gainesville, Florida, United States